Thanks, it gets further now, in fact installation seems to complete. I continued accepting the defaults and the installer created two 25MB partitions, formatted them and copied files to one. Then it created a boot floppy disk. After that it tells you to reboot with the boot floppy in DF0:. (Archive with HDF and boot floppy attached; remove .zip extension before unpacking it.)

[I think I forgot to enable RDB mode for the HDF in the config I attached above. You should do that before running the installer, if you want to run it yourself.]

On booting the boot floppy, its startup-sequence runs BindDrivers (which loads the driver, which automatically mounts the partitions) then transfers control to the HD. After a short while though the startup sequence is interrupted, saying SYS:gvpscripts/tstGVPscsi failed returncode 20